# Theodor Magnus Fries

Theodor "Thore" Magnus Fries (28 October 1832 – 29 March 1913), was a Swedish botanist, lichenologist, and Arctic explorer. The son of the renowned mycologist Elias Magnus Fries, he served as a professor of botany and applied economics at Uppsala University from 1877 and as the university's rector from 1893 to 1899. He made significant contributions to lichenology, particularly through his work Lichenographia scandinavica (1871–1874), and introduced innovative research methods including the systematic use of microscopy in botanical studies. He was elected to the Royal Swedish Academy of Sciences in 1865 and was awarded the Order of the Polar Star in 1903.
Fries participated in two Arctic expeditions led by Adolf Erik Nordenskiöld, traveling to Bear Island and Spitsbergen in 1868 and to Greenland in 1871. As an educator, he emphasised hands-on practical instruction in botany and mentored several botanists who went on to make significant contributions to the field. He made substantial contributions to preserving Carl Linnaeus's legacy, including publishing a two-volume biography of Linnaeus (1903) and managing the Linnaean Foundation at Hammarby. His three sons, Robert Elias, Thoralf Gustaf Elias, and Thore Christian Elias, all pursued academic careers, continuing the family's botanical and scholarly traditions.

## Early life and education

Theodore Magnus Fries was born on 28 October 1832 in Femsjö [sv], Jönköping County to professor Elias Magnus Fries and Christina Wieslander. His father, a Professor of Botany at Uppsala University, and his mother provided a strong academic foundation. Theodore was the eldest of three children, followed by Elias Petrus Fries (1834–1858), a philosopher and mycologist, and Oscar Robert Fries [sv] (1840–1908), a physician and mycologist in Gothenburg.
Småland, Theodore's birthplace, had a traditional of scholarship, famously producing figures such as Carl Linnaeus. Thore was deeply influenced by his familial surroundings, which were steeped in academic and botanical interests. Immersed in this academic environment, Theodore spent part of his childhood with his grandparents in Femsjö, where he developed a strong personality. His early years were characterised by a supportive environment fostering curiosity and learning.
Theodore began his formal education in 1836 when his family moved to Uppsala following his father's appointment as a professor. This move shaped Theodore's academic and botanical interests. Guided by educators such as Johan Arrhenius [sv], he progressed quickly, studying Latin by age seven. At Uppsala Cathedral School, he demonstrated remarkable dedication, graduating as the top student in 1851. His time at the school was marked by an unwavering commitment to education, leading him to graduate as the top student in 1851, a testament to his intellectual capabilities and the strong foundation laid during his early years. While still completing his education, Theodore contributed to scientific research. At seventeen, he published his first work, documenting a botanical excursion in Uppland, where he observed Najas flexilis in Lake Hedersvik and described aegagropila algae formations. His studies of Swedish flora culminated in publications on Corydalis species in 1854 and Isoetes species in 1852 and 1863. These early contributions, inspired by his family's academic legacy and Uppsala's intellectual environment, shaped his lifelong dedication to botany.

## Academic and research career

Theodore "Thore" Magnus Fries began his academic and research career after graduating from Uppsala Cathedral School, where his early publications reflected a budding interest in botany. Fries earned a Bachelor of Philosophy in 1856 and a Ph.D. in 1857, presenting a thesis on lichens titled "Stereocaulis et Pilophoris commentatio". His academic journey was not without challenges, including disputes with Carl Jacob Boström over his unconventional path to scholarly success.
Fries held several early academic positions, including amanuensis at the botanical garden and museum (1853–1859) and docent in botany at Uppsala University from December 1857. Fries balanced his academic career with teaching roles, including natural history instruction at Uppsala Lyceum (1856–1860) and a position at the Ultuna Agricultural Institute (1863–1867), where he later joined the board of directors (1878–1889). His dedication to public education extended further as chair of the Uppsala County Folk High School board (1881–1885) and director of the Uppsala Workers' Institute (1883–1893), reflecting his commitment to expanding educational opportunities. From 1893 to 1899, he was the vice-chancellor of Uppsala University.
Fries advanced botanical research by adopting microscopy—a technique his father had been hesitant to use. By integrating traditional floristic methods with microscopic analysis, he established innovative standards for botanical investigation during his era. His growing scientific reputation led to his election to the Royal Swedish Academy of Sciences in 1865.
In January 1862, Fries faced a major professional challenge due to a conflict with Johann Emanuel Zetterstedt and William Nylander, rooted in longstanding academic rivalries and differing scientific viewpoints. The dispute revolved around contrasting approaches to lichen taxonomy. Fries supported the Italian-German school, prioritising fruiting bodies and spores in classification while downplaying thallus characteristics. This stance directly opposed the views of Nylander, a leading authority in lichenology at the time. Tensions escalated following Fries's publication of Genera heterolichenum europaea recognita (1861), where he criticised Nylander's classification methods. During Fries's candidacy for a position at Uppsala, Nylander's objections were leveraged in an attempt to thwart his appointment.
Despite these challenges, Fries's competence and dedication to botany earned him the role of academic assistant in "botany and practical economics". The Fries–Nylander taxonomic debate had enduring consequences for lichenology, persisting into the 20th century. When Zahlbruckner, a prominent lichenologist, adopted Nylander's taxonomic framework in his works (1921–40), some scholars regarded it as a setback for the field. However, Fries's methodology retained influential advocates, including Edvard A. Vainio.
Fries's research was marked by meticulous attention to detail and a broad species concept. He carefully documented intraspecific variations, producing specimens of exceptional quality that formed the foundation of Uppsala's renowned lichen collection. His records often included subtle features overlooked by others, some of which were only recognised by later researchers.
Fries was also involved in the debate over the Schwendener theory, proposed in 1869, which posited the dual nature of lichens. Initially, both Fries and Nylander rejected the theory. However, displaying openness to new evidence, Fries tasked his student, Karl Bror Jakob Forssell, with investigating it further. Forssell's findings in 1883 led Fries to revise his stance, a change later reflected in his 1897 botany textbook.
Fries's scientific expeditions, including journeys to polar regions, greatly advanced his research in lichenology and phanerogams (seed plants). His research travels extended beyond the Arctic to include visits to herbaria across Europe, including France, Finland, and Denmark. He spent several weeks studying with the lichenologist August von Krempelhuber in Munich.
Lichenographia scandinavica (1871–1874) established Fries as a prominent figure in Swedish botany, alongside his studies on Linnaeus's botanical legacy. This comprehensive work on Scandinavian lichens, though incomplete, remained the definitive flora reference for the region for many decades after its publication. His taxonomic contributions included the description of several important lichen genera that remain widely recognised today, including Caloplaca, Chaenotheca, and Xanthoria. His tenure as Borgströmian professor of botany and practical economy, beginning in 1877, and his role as rector of Uppsala University demonstrate his impact on botanical science and education. Beyond these core academic roles, Fries served as inspector for multiple student nations, including Gotlands nation (1878–1899) and Smålands nation (1882–1899). His administrative influence extended beyond the university; he served as inspector of the Fjellstedt School from 1895, chaired the school committee from 1899 to 1902, and led the examination commission at Stockholm University College in 1904. Fries participated in regional governance as a member of the Uppsala County Council from 1899 to 1906.

### Arctic expeditions

Fries's contributions to Arctic botany were so significant that he became known as the 'father of Arctic lichenology'. His first major polar expedition took place in 1868 when he joined Adolf Erik Nordenskiöld's expedition aboard the steamer Sofia to Bear Island and Spitsbergen. Collaborating with the ship's doctor, Carl Nyström, he co-authored the illustrated "The Swedish Polar Expedition 1868". The work, praised for its vivid depiction of the Arctic environment and the researchers' experiences, offers readers an account of early Arctic exploration.
Fries' second significant Arctic expedition, directed towards Greenland, occurred in 1871 aboard the royal vessels Ingegerd and Gladan. In addition to its scientific achievements, the expedition included Fries's visits to Newfoundland and England. Drawing on his observations, Fries published "Greenland, its nature and inhabitants" in 1872, providing an in-depth account of the island's environment and culture. The work advanced contemporary understanding of Greenland's natural history and its people.

## Contributions and legacy

Fries made significant contributions to lichenology, historical botany, and the study of Linnaeus, including major works like Lichenographia Scandinavica. He revitalised the Uppsala Botanical Garden and Museum, aligning plant collections with scientific principles and improving the museum's resources. His efforts extended to the Linnaean Foundation at Hammarby, aiming to preserve the Linnaean heritage.
Fries's research style was characterised by exceptional attention to detail and thorough documentation practices that proved valuable long after his time. His specimen descriptions were remarkably comprehensive, often including subtle features that would not be rediscovered by other researchers until decades later. For example, his detailed observations of unusual iodine reactions in hymenia and the presence of distinct types of paraphyses in certain species remained the most complete accounts of these features well into the modern era. The specimens he preserved in Uppsala's lichen herbarium are noted for their careful preparation and thorough documentation, making them valuable reference materials for contemporary researchers. He also made lasting contributions to lichen terminology, including introducing the term phyllocladium in his 1858 commentary on the genus Stereocaulon.
Fries's impact as an educator was particularly significant, revolutionising botanical education through his innovative teaching methods. His lichenological courses were groundbreaking for their time, combining theoretical lectures with extensive hands-on practical exercises that allowed students to study lichen structure both macroscopically and microscopically. This comprehensive approach to botanical education helped establish a new standard for scientific instruction in the field.
Under his guidance, a remarkable number of students went on to become prominent figures in botany and lichenology. His notable students included Sigfrid Oskar Immanuel Almquist [sv] (1844–1923), who specialised in crustose lichens; Carl Jacob Boström [sv] (1856–1898), known for his work on lichen anatomy; Teodor Hedlund [sv] (1861–1953), who contributed to lichen taxonomy; Per Johan Hellbom [sv] (1827–1903), who conducted extensive lichen surveys; Johann Hulting [sv] (1842–1929), who focused on regional lichen flora; Gustaf Oskar Andersson Malme (1864–1937), who became a prominent tropical lichenologist; and Rutger Sernander (1866–1944), who advanced the field of phytosociology.
Furthermore, Fries's commitment to education was demonstrated through his leadership and involvement in the Botanical section of the Natural Science Students' Society, which he founded and sustained for over fifty years. This involvement was not just administrative; Fries actively engaged with students, fostering an environment of inquiry and discovery that extended beyond the classroom. He was known to start each academic term with practical demonstrations in the botanical garden, ensuring students not only learned about plant life theoretically but could also recognise and understand it in a real-world context. This hands-on approach, combined with his dynamic teaching style, left a lasting impact on generations of botanists, making his courses memorable and establishing a rich educational legacy.

## Personal life

Thore Fries's personal life revolved around his family and academic community. On 8 August 1875, he married Cathrina Gustafva Anjou in Stockholm's Maria parish. Born on 6 November 1844, in Österby bruk, Film parish, she was the daughter of Claes Abraham Anjou, a master hammersmith, and Anna Maria Öhrn. Their marriage would last until Fries's death in 1913, with Cathrina surviving him by fourteen years until her death on 31 October 1927, in Uppsala. The couple had three sons who carried on the Fries family's academic legacy. Robert Elias Fries (1876–1966) became a docent of botany at Uppsala University; Thoralf Gustaf Elias Fries (1882–1963) served as a notary at the philosophical faculty at Uppsala University and collected phanerogams; and Thore Christian Elias Fries (1886–1930) became a docent of plant biology at Uppsala University.
Fries maintained an active correspondence with students and colleagues, and his home served as a meeting place for academics. His expeditions to polar regions combined scientific research with exploration. He documented these experiences in letters and stories shared with friends and family. His work on Linnaean research and efforts to preserve Swedish botanical history demonstrated his commitment to the country's scientific heritage.

## Recognition

Fries received several honours during his career. In 1903, Fries was awarded the great cross of the Order of the Polar Star, a prestigious Swedish honour recognising his contributions to science and education. He received an honorary doctorate in medicine (Dr. med. honoris causa) from Uppsala University in 1890. He held memberships in numerous domestic and international learned societies.
Fries contributed to educational reform and worked to preserve the Linnaean tradition. He supported the creation of a botanical travel scholarship in honor of his father, Elias Fries, which aimed to advance botanical studies.

## Final years and death

Thore Fries's later years were defined by ongoing academic engagement and personal reflection. Despite his advancing age and declining health, he remained dedicated to research and teaching. Fries's dedication to Linnaean studies culminated in Iter Lapponicum, a comprehensive analysis of Linnaeus's Lapland journey that highlighted his meticulous scholarship and profound respect for Linnaeus. Completed in his later years, this work underscored Fries's role as a link between historical and contemporary botanical exploration, enriching the understanding of Linnaeus's legacy. His final contributions to the field were characterised by the same thoroughness and passion that had defined his entire career.
Fries remained active in his work until the very end, editing Linnaeus's letters just two days before his death. He died peacefully on 29 March 1913, leaving a lasting legacy in the botanical and academic communities. His death marked a significant loss to botany and to those who knew him personally. His funeral on 3 April 1913 at Uppsala Cathedral was attended by family, friends, colleagues, and students, demonstrating the broad impact of his life and work. The ceremony was solemn and respectful, with representatives from Sweden's academic and scientific communities in attendance. Fries's death was deeply mourned, not only as the loss of a brilliant scientist but also as that of a mentor, friend, and inspirational figure. His contributions to botany, dedication to education, and personal warmth left a lasting impression on all who knew him. In his memory, the arrival of spring symbolised the renewal and growth he championed throughout his life and career. Fries is remembered for his scientific achievements, his character, and his enduring influence as a mentor to future generations.

## Selected works

A complete listing of all of Fries's publications and exsiccata were published by Markus Hulth [sv] in 1914. His published works included exsiccata (published sets of dried specimens), such as 'Lichenes exsiccati Sueciae redigit Th. Fries (numbers 331–360)' and Lichenes Scandinaviae, rariores et critici 1859–65. Some of his major works include:
* Fries, Theodore Magnus (1861). Lichenes arctoi Europae Groenlandiaeque hactenus cogniti [Currently known Arctic lichens of Europe and Greenland]. Nova acta Regiae Societatis Scientiarum Upsaliensis (in Latin). Vol. 3. pp. 103–398.
* Fries, Theodore Magnus (1861). Genera Heterolichenum Europaea Recognita [Recognised European Genera of Heterolichens]. Edquist.
* Fries, Theodore Magnus (1884). Växtriket. Framställning af växternas lif och förnämsta former [The Plant Kingdom: Representation of plant life and principal forms] (in Swedish). Stockholm: Fahlcrantz. pp. 1–326.